Means for grinding the mantle surfaces of rollers having arc-shaped generatrices



Feb. 3, 1925. I 1,525,337

' V. A. SVENSSON :4 NS FOR GRINDI THE MANTLE su ACES OF LERS HAV ING SHAPED GENER ICES Filed Oct. 8, 1920 2 Sheets-Shut 1 a V. A. SVENSSON MEANS FOR GRINDING THE MANTLE SURFACES 0F ROLLERS HAVING ARC SHAPED GENERATRICES 1 Filed Oct. 8, 1920 2 Shuts-Sheet 2 Patented Feb. 3, 1925.

UNITED STATES VICTOR A. SVENSSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO AKTIEBOLAGET SV'ENSKA KULLAGERFABRIKEN, OF GOTTENBORG, SWEDFDT, .A. CORPORATION OF SWEDEN.

MEANS FOR-GRINDING THE MAN'ILE SURFACES GENERATBICES.

OF ROLLERS HAVING ABC-SHAPED Application filed October 8, 1920. Seria1 No. 415,518.

To all'whom it may concern:

Be it known that I, VICTOR ABRAHAM SvENssoN, a subject of the King of Sweden, residing at the city of New York, borough of Brooklyn, county of Kings, and State of New ,York, have invented certain new and useful Improved Means for Grinding the Mantle Surfaces of Rollers Having Arcbhaped Greneratrices of which the following is a specification, reference bein had therein to the accompanying drawing.

This invention relates to. an improved means for grinding the mantle surfaces of' rollers having arc-shaped generatrix the centre of which does not coincide with the centre of the roller and is especially adapted for grmding large rollers for roller bearings having spherical outer race.

The object of the invention is to provide mechanism by means of which it will be possible to manufacture rollers the generatrix of which is an exact arc of a circle independently of the wear of the grinding disc.

The invention consists, chiefly, in this that the grinding operation is performed by means of a grinding disc having spherical or substantially spherical working surface and that the roller during the grinding operation is rotated about its own axis and at the same time is brought to swing about an axis which passes through the centre of the working surface of the grinding disc and forms an angle with axis of the latter.

In the accompanying drawing I have illustrated one embodyment of my invention. Fig. 1 shows diagrammatically a sectional view of the roller and the grinding disc. Fig. 2 is a section on the line AB in Fig. 1. Fi% 3 is a plan View showing how the parts in igs. 1 and 2 are mounted and operated.

Referring to Figs. 1 and 2, 1 is the grinding disc which is secured to a rotatable shaft 2 and has a concavely spherical working surface having its centre in 0 and the radius R. The roller 3 to be ground in such manner that its generatrix obtains the shape of an exact are of acircle with the radius R is brought to rotate during the grinding operation about its own axis 6 and at the same time to swing centre 0, for instance an axis 50 parallel with the axis 6. The roller is for that purabout an axis through the' pose inounted in a suitable carrier shown in Fig. 3 and described later on, which can perform said two movements in relation to the grinding disc. The rotation of the roller about the axis 6 should preferably take place with an essentially greater speed than the movement about the axis 50 the result being 'that each point of the mantle surface of the roller will come into contact with the working surface of the grinding disc several times for each swinging movement about the axis 5-0. The said swinging movement can either be an oscillatory movement between the two limits in which the roller loses its contact with the grinding disc or be a continuous rotation about the axis 5-0 in constant direction. By the said combined movements of the roller in relation to the axis of the grinding disc it is assured that every point of a generatrix of the roller always come into contact with,

different points of the working surface of the grinding disc, the result being that the latter is worn absolutely uniformly and always maintains an exactly spherical form and the generatrix of the mantle surface of the roller obtains the desired shape of an exact arc of a circle having the radius B.

As the grinding disc is worn it is fed towards the point 0 by means of any wellknown automatic feeding device in such manner that its working surface maintains a constant distance from said centre.

In Fig. 3 I have illustrated how the grinding disc and roller are mounted in the proper relation to each other, and have illustrated means for rotating the grinding disc and roller and swinging the latter, in carrying out my method. In this figure it will be seen that the shaft 2 carrying the grinding disc, is mounted for rotation in a bearing 7 on a base or bed 8, and has fixed to it a.

and pressed against the roller by a spring 15 housed in a cavity in the yoke and hearing against the latter and a shoulder on the stud, whereby the stud 14 maybe moved outwardly against the force of the spring to disengagethe roller so as to permit the same to be removed and a new one set in its place. The stem of the stud 14 is extended outwardly through the yoke and has connected with it a flexible driving shaft 16 driven from a suitable source of power, the form and character of the engaging surfaces of the stud and roller being such that the rotary motion of the stud 14 by the. flexible shaft will, in connection with the engagement of theroller with the rotary grinding surface at therelative angles shown, bring about a rotation of the roller on its geometrical axis. To-one side of the axis 6-6 the yoke is formed with hubs '17, 17 provided with alignedbearing cavities 18, 18 in which extend pivoted studs 19, 19 projecting inwardly from standards 20, 20 rising from the base 8, by which means the yoke is swinginglymounted on the axis 5 -5 and which extends parallel to the geometrical axis of the roller and passes through the center 0 of the spherical face of the grinding .disc.

tion the operator grasps the handle 10 of the yoke .and swings the same back and forth on the axis 55. with the result that by the combined operations, every point of a generatrix of the roller will come into contact with different points of the working surface of the grin-ding disc, and the grinding disc will be Worn uniformly and will always maintain an exactly spherical form, and the generatrix of 'the mantle surface of the roller will be given the shape of an exact arc of a circle having the radius R. I

Fig. 3 above described illustrates one form by way of example of the mounting and operation of the parts. but it is manifest that other forms of mounting may be adopted without departing from the spirit of the invention.

What I claim is:

In a mechanism of the type described, the combination ofa rotary grinder having a grinding surface constituting a portion of a sphere, a pivoted holder having centers for rotatably supporting a workpiece, such as a roller, the pivots of the holder lying in a line parallel to the axial line of said centers and being intersected by the axis of rotation of the grinder, and means for swinging the holder on its pivot.

In testimony whereof I have signedmy name.

VICTOR. A. SVENSSON. 

